A wireless device receives a control command for transmission of a random access preamble on a first cell. The wireless device transmits the random access preamble in parallel with a first control packet, a second packet and/or a third packet. The wireless device determines a transmission power for the random access preamble. If a total calculated transmission power exceeds a predefined value, the wireless device reducing or scaling linear transmission power of one or more of the at least one parallel uplink transmission considering a higher priority for the transmission power of the random access preamble.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method comprising: a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device: i) configuration of a plurality of cells comprising a primary cell and at least one secondary cell; ii) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups, said plurality of cell groups comprising: (1) a primary cell group comprising a first subset of said plurality of cells, said subset comprising said primary cell; and (2) a secondary cell group comprising a second subset of said at least one secondary cell; b) receiving, by said wireless device, a control command for transmission of a random access preamble on a first cell in said plurality of cells, said random access preamble transmitted in parallel with at least one of the following parallel uplink transmissions: i) a first control packet on an uplink control channel of said primary cell; ii) a second packet comprising uplink control information on an uplink data channel of one of said plurality of cells; and iii) at least one third packet on at least one uplink data channel of said plurality of cells; c) determining, by said wireless device, a preamble transmission power for said random access preamble; and d) if a total calculated transmission power exceeds a predefined value, said wireless device obtaining transmission power of said at least one parallel uplink transmission according to the following priorities: i) said random access preamble transmission having a first priority; ii) said first control packet having a second priority lower than said first priority; iii) said second packet having a third priority lower than said second priority; and iv) said at least one third packet having a fourth priority lower than said third priority; and wherein said priorities are employed by said wireless device to reduce or scale linear transmission power of one or more of said at least one parallel transmission such that an updated value of said total calculated transmission power is equal to or less than said predefined value.
A wireless device receives configuration information from a base station to set up multiple cells, including a primary cell and one or more secondary cells, organized into cell groups (primary and secondary). Upon receiving a command to transmit a random access preamble on a specified cell, the device may transmit this preamble simultaneously with other uplink data: a control packet on the primary cell, a control packet on a data channel of any cell, and/or other data packets on data channels of any cell. If the total calculated transmission power for all simultaneous transmissions exceeds a limit, the device reduces the power of the parallel uplink transmissions based on a priority order: preamble (highest), primary cell control packet, secondary cell control packet, and other data packets (lowest). This power reduction ensures the total transmission power stays within the limit, prioritizing the random access preamble.
2. The method of claim 1 , wherein said at least one control message further causes in said wireless device configuration of a plurality of channel parameters for the following channels: a) said uplink control channel on said primary cell; b) said at least one uplink data channel; and c) an uplink random access channel on said first cell.
The method described for managing transmission power scaling when sending a random access preamble (as described in the previous claim) also involves the base station configuring various channel parameters for the uplink control channel on the primary cell, at least one uplink data channel (used for data packets), and the uplink random access channel on the cell where the preamble is being transmitted. These parameters define how these channels are used and contribute to the power calculations.
3. The method of claim 1 , wherein said scaling linear transmission power comprises scaling linear transmission power by a scaling factor: a) greater than or equal to zero; and b) smaller than or equal to one.
The method for scaling the transmission power of parallel uplink transmissions (as described in claim 1) uses a scaling factor. This scaling factor is a value between 0 and 1 (inclusive). Multiplying the original transmission power by this factor reduces the power level. A scaling factor of 1 means no reduction, while a scaling factor of 0 means the transmission is effectively turned off.
4. The method of claim 1 , wherein said first cell is said primary cell.
In the described method of managing power during parallel transmissions (as described in claim 1), the cell on which the random access preamble is transmitted is specifically the primary cell. Therefore, the device transmits the preamble on the primary cell while potentially transmitting other uplink data on other cells.
5. The method of claim 1 , wherein said total calculated transmission power is calculated for a subframe.
The calculation of the total transmission power, and the subsequent power scaling adjustments described in claim 1, are performed for each subframe. A subframe is a specific time interval used for scheduling transmissions in wireless communication systems. The device recalculates and adjusts power levels every subframe to stay within the predefined power limit.
6. The method of claim 1 , wherein calculation of said total calculated transmission power comprises adding all of the following transmission powers: a) a linear transmission power of said random access preamble; b) a linear transmission power of said first control packet if said first control packet is transmitted; c) a linear transmission power of said second packet if said second packet is transmitted; and d) a linear transmission power of said at least one third packet if said at least one third packet is transmitted.
The calculation of the total transmission power, used to determine if power scaling is necessary (as described in claim 1), involves summing the linear transmission powers of all simultaneous uplink transmissions. This includes the power of the random access preamble, the power of the first control packet (if transmitted), the power of the second packet (if transmitted), and the power of any other data packets (if transmitted). The "linear" transmission power refers to the power before any dB conversions or scaling is applied.
7. The method of claim 6 , wherein if said at least one parallel uplink transmission consists of said first control packet, a calculated linear transmission power of said first control packet is equal to a minimum of: a) said linear transmission power of said first control packet; and b) said predefined value minus said linear transmission power of said random access preamble.
In the scenario where the device is transmitting a random access preamble in parallel with a first control packet on the primary cell (as described in claim 6), and the total power exceeds the limit, the calculated power for the first control packet is set to the lower of two values: its original calculated power OR the predefined total power limit minus the random access preamble's power. This ensures the control packet's power is reduced if necessary to stay within the limit, giving priority to the preamble.
8. The method of claim 6 , wherein if said at least one parallel uplink transmission consists of said second packet, a calculated linear transmission power of said second packet is equal to a minimum of: a) said linear transmission power of said second packet; and b) said predefined value minus said linear transmission power of said random access preamble.
When the device transmits a random access preamble in parallel with a second packet comprising uplink control information on a data channel (as described in claim 6), and the total power exceeds the limit, the calculated power for the second packet is the lower of its original calculated power OR the predefined total power limit minus the random access preamble's power. The preamble is prioritized, and the second packet's power is reduced if needed to remain within the power limit.
9. The method of claim 6 , wherein if said at least one parallel uplink transmission consists of said first control packet and said second packet: a) a calculated linear transmission power of said first control packet is equal to a minimum of: i) said linear transmission power of said first control packet; and ii) said predefined value minus said linear transmission power of said random access preamble; and b) a calculated linear transmission power of said second control packet is equal to a minimum of: i) said linear transmission power of said second control packet; and ii) said predefined value minus a sum of: (1) said linear transmission power of said random access preamble; and (2) said calculated linear transmission power of said first control packet.
When a random access preamble is transmitted concurrently with a first control packet on the primary cell and a second packet comprising uplink control information on a data channel (as described in claim 6), the power adjustment process works as follows: First, the calculated power of the first control packet is set to the minimum of its original power or the total power limit minus the preamble power. Then, the calculated power of the second packet is set to the minimum of its original power or the total power limit minus the sum of the preamble power and the adjusted power of the first control packet. This prioritizes the preamble, then the first control packet, before adjusting the second packet's power.
10. The method of claim 6 , wherein if said at least one parallel uplink transmission consists of said first control packet and said at least one third packet, then: a) a calculated linear transmission power of said first control packet is equal to a minimum of: i) said linear transmission power of said first control packet; and ii) said predefined value minus said linear transmission power of said random access preamble; and b) a calculated linear transmission power for each of said at least one third packet is calculated by scaling said linear transmission power of each of said at least one third packet by a scaling factor such that said total calculated transmission power is equal to or less than said predefined value, said scaling factor being equal to or less than one.
In the case where a device transmits a random access preamble along with a first control packet on the primary cell and at least one third packet on at least one uplink data channel (as described in claim 6), the power adjustment process is as follows: The power of the first control packet is set to the lower of its original power or the total power limit minus the preamble's power. Then, the remaining data packets have their powers reduced by applying a scaling factor (between 0 and 1) to each of them. The scaling factor is selected such that the final total power, including the preamble, adjusted control packet, and scaled data packets, is less than or equal to the predefined power limit.
11. A method comprising: a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device: i) configuration of a plurality of cells comprising a primary cell and at least one secondary cell; and ii) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups, said plurality of cell groups comprising: (1) a primary cell group comprising a first subset of said plurality of cells, said subset comprising said primary cell; and (2) a secondary cell group comprising a second subset of said at least one secondary cell; b) receiving, by said wireless device, a control command for transmission of a random access preamble on a first cell in said plurality of cells, said random access preamble transmitted in parallel with at least one of the following parallel uplink transmissions: i) a first control packet on an uplink control channel of said primary cell; ii) a second packet comprising uplink control information on an uplink data channel of one of said plurality of cells; and iii) at least one third packet on at least one uplink data channel of said plurality of cells; c) determining, by said wireless device, a transmission power for said random access preamble; and d) if a total calculated transmission power exceeds a predefined value, said wireless device reducing or scaling linear transmission power of one or more of said at least one parallel uplink transmission according to a predefined rule considering a higher priority for said transmission power of said random access preamble compared with a transmission priority of: i) said first control packet; ii) said second packet; and iii) said at least one third packet.
A wireless device receives configuration information from a base station to set up multiple cells, organized into primary and secondary cell groups. When the device receives a command to transmit a random access preamble on a specific cell, and does so in parallel with other uplink data (control packets or data packets), the total transmission power is checked against a predefined value. If the total power exceeds the limit, the device reduces the power of the parallel uplink transmissions according to a predefined rule. This rule prioritizes the preamble over all other transmissions (first control packet, second packet, and any other third packets).
12. The method of claim 11 , wherein calculation of said total calculated transmission power comprises adding all of the following transmission powers: a) a linear transmission power of said random access preamble; b) a linear transmission power of said first control packet if said first control packet is transmitted; c) a linear transmission power of said second packet if said second packet is transmitted; and d) a linear transmission power of said at least one third packet if said at least one third packet is transmitted.
In the method described in claim 11, the calculation of the total transmission power involves summing the linear transmission powers of all simultaneous uplink transmissions. This includes the power of the random access preamble, the power of the first control packet if it's being transmitted, the power of the second packet if it's being transmitted, and the power of any other data packets if they are being transmitted.
13. The method of claim 12 , wherein if said at least one parallel uplink transmission consists of said first control packet, a calculated linear transmission power of said first control packet is equal to a minimum of: a) said linear transmission power of said first control packet; and b) said predefined value minus said linear transmission power of said random access preamble.
Building on the method in claim 12, if the device transmits a random access preamble in parallel with a first control packet on the primary cell, and the total power exceeds the predefined limit, the calculated transmission power of the first control packet is set to the lower of: its initially calculated power, OR the predefined power limit minus the linear transmission power of the random access preamble.
14. The method of claim 12 , wherein if said at least one parallel uplink transmission consists of said second packet, a calculated linear transmission power of said second packet is equal to a minimum of: a) said linear transmission power of said second packet; and b) said predefined value minus said linear transmission power of said random access preamble.
Expanding on the method described in claim 12, if the device is transmitting a random access preamble in parallel with a second packet containing uplink control information, and the total power surpasses the limit, the calculated power for the second packet is set to the lower of its initial power or the total allowed power minus the power of the random access preamble.
15. The method of claim 11 , wherein said reduce or scale linear transmission power is performed over a period of one subframe.
In the method described in claim 11, the power reduction or scaling of linear transmission power is performed over a period of one subframe. A subframe represents a specific time slot used for transmissions, implying that the power adjustments are made on a per-subframe basis to maintain the transmission power within limits.
16. A wireless device comprising: a) one or more communication interfaces; b) one or more processors; and c) memory storing instructions that, when executed, cause said wireless device: i) to receive at least one control message from a base station, said at least one control message causing in said wireless device: (1) configuration of a plurality of cells comprising a primary cell and at least one secondary cell; and (2) assignment of each of said at least one secondary cell to a cell group in a plurality of cell groups, said plurality of cell groups comprising: (a) a primary cell group comprising a first subset of said plurality of cells, said subset comprising said primary cell; and (b) a secondary cell group comprising a second subset of said at least one secondary cell; ii) to receive a control command for transmission of a random access preamble on a first cell in said plurality of cells, said random access preamble transmitted in parallel with at least one of the following parallel uplink transmissions: (1) a first control packet on an uplink control channel of said primary cell; (2) a second packet comprising uplink control information on an uplink data channel of one of said plurality of cells; and (3) at least one third packet on at least one uplink data channel of said plurality of cells; iii) to determine a transmission power for said random access preamble; and iv) if a total calculated transmission power exceeds a predefined value, to reduce or scale linear transmission power of one or more of said at least one parallel uplink transmission according to a predefined rule considering a higher priority for said transmission power of said random access preamble compared with a transmission priority of: (1) said first control packet; (2) said second packet; and (3) said at least one third packet.
A wireless device includes communication interfaces, processors, and memory. The memory contains instructions that, when executed, cause the device to: receive cell configurations from a base station (primary and secondary cells, organized into cell groups); receive a command to transmit a random access preamble on a cell, which may happen in parallel with other uplink data transmissions (control packets or data packets); determine the transmission power for the preamble; and if the total calculated power exceeds a limit, reduce the power of other parallel transmissions according to a rule that gives the preamble higher priority than the other transmissions.
17. The wireless device of claim 16 , wherein said predefined value is a configured maximum transmission power of said wireless device.
In the wireless device described in claim 16, the predefined power limit used for determining whether to reduce transmission power is a configured maximum transmission power for the device. The device will adjust its transmission powers to never exceed this configured maximum.
18. The wireless device of claim 16 , wherein a configured sounding reference signal transmission is dropped if said total calculated transmission power exceeds a predefined value.
In the wireless device described in claim 16, if the calculated total transmission power (including the random access preamble and other parallel transmissions) exceeds the predefined power limit, then a scheduled sounding reference signal (SRS) transmission is dropped (not transmitted). This provides another way to prioritize the random access preamble over other signals.
19. The wireless device of claim 16 , wherein a transmission period of said random access preamble is more than one subframe.
In the wireless device described in claim 16, the random access preamble may have a transmission period that spans more than one subframe. This means that the preamble transmission may occupy multiple consecutive time slots.
20. The wireless device of claim 16 , wherein a transmission period of said random access preamble overlaps a first subframe and a second subframe.
In the wireless device described in claim 16, the transmission period of the random access preamble overlaps a first subframe and a second subframe. This indicates that the preamble transmission starts within one subframe and continues into the next.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
January 25, 2013
September 3, 2013
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.